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/// <disclaimer>
/// This software is protected by your own conscience (c).
/// You can use it however you want and wherever you want.
/// You are allowed to change this code, copy this code, or delete this code.
/// You can buy this code; sell this code; present this code to your mom on her birthday.
/// You can replace author�s name with your own. You also can replace all the code with your own leaving
/// only author�s name.
/// The only thing you cannot do, is to violate this license agreement. You simply are not able to.
/// </disclaimer>
/// <author>
/// Sergei Zotin
/// szotin@shaw.ca
/// Burnaby, BC, Canada
/// Feel free to contact me for bug reports, feature requests and contract offers.
/// </author>
/// <version>1.6</version>
using System;
using System.Threading;
using ZEN.Threading;
using System.IO;
class A
{
private B b;
private int x;
private int y;
public B TheB
{
get
{
LockManager.Lock ( this );
try
{
return b;
}
finally
{
LockManager.Unlock ( this );
}
}
set
{
LockManager.Lock ( this );
try
{
b = value;
}
finally
{
LockManager.Unlock ( this );
}
}
}
public int X
{
get
{
LockManager.Lock ( this );
try
{
return x;
}
finally
{
LockManager.Unlock ( this );
}
}
// NEW: Now we catch DeadlockException internaly, release all locks and retry operation.
// NEW: That allows thread to continue excecution rather than breaking.
set
{
bool retry;
do
{
retry = false;
LockManager.Lock ( this );
try
{
Thread.Sleep ( 10 ); // just to increase the odds of a deadlock
x = value;
b.X = value;
}
catch ( DeadlockException )
{
retry = true;
}
finally
{
LockManager.Unlock ( this );
}
} while ( retry );
}
}
public int Y
{
get
{
LockManager.Lock ( this );
try
{
return y;
}
finally
{
LockManager.Unlock ( this );
}
}
set
{
LockManager.Lock ( this );
try
{
Thread.Sleep ( 10 ); // just to increase the odds of a deadlock
y = value;
}
finally
{
LockManager.Unlock ( this );
}
}
}
}
class B
{
private A a;
private int x;
private int y;
public A TheA
{
get
{
LockManager.Lock ( this );
try
{
return a;
}
finally
{
LockManager.Unlock ( this );
}
}
set
{
LockManager.Lock ( this );
try
{
a = value;
}
finally
{
LockManager.Unlock ( this );
}
}
}
public int X
{
get
{
LockManager.Lock ( this );
try
{
return x;
}
finally
{
LockManager.Unlock ( this );
}
}
set
{
LockManager.Lock ( this );
try
{
Thread.Sleep ( 10 ); // just to increase the odds of a deadlock
x = value;
}
finally
{
LockManager.Unlock ( this );
}
}
}
public int Y
{
get
{
LockManager.Lock ( this );
try
{
return y;
}
finally
{
LockManager.Unlock ( this );
}
}
// NEW: Now we catch DeadlockException internaly, release all locks and retry operation.
// NEW: That allows thread to continue excecution rather than breaking.
set
{
bool retry;
do
{
retry = false;
LockManager.Lock ( this );
try
{
Thread.Sleep ( 10 ); // just to increase the odds of a deadlock
y = value;
a.Y = value;
}
catch ( DeadlockException )
{
retry = true;
}
finally
{
LockManager.Unlock ( this );
}
} while ( retry );
}
}
}
class Step3
{
private A a;
private B b;
private Step3 ( A _a, B _b )
{
a = _a;
b = _b;
a.TheB = b;
b.TheA = a;
}
// NEW: Now exception handling is removed. a.X = i doesn't throw DeadlockException any more.
private void RunX ()
{
for ( int i = 0; i < 20; i++ )
{
a.X = i;
System.Console.WriteLine ( "Thread X: a.X={0}; b.X={1}", a.X, b.X );
}
}
// NEW: Now exception handling is removed. a.X = i doesn't throw DeadlockException any more.
private void RunY ()
{
for ( int i = 0; i < 20; i++ )
{
b.Y = i;
System.Console.WriteLine ( "Thread Y: a.Y={0}; b.Y={1}", a.Y, b.Y );
}
}
// NEW: We changed logging from console to file "deadlock.log".
[STAThread]
static void Main ( string[] args )
{
A a = new A();
B b = new B();
Step3 step3 = new Step3 ( a, b );
TextWriter log = new StreamWriter ( "deadlock.log", false );
LockManager.Log = log;
Thread threadX = new Thread ( new ThreadStart ( step3.RunX ) );
Thread threadY = new Thread ( new ThreadStart ( step3.RunY ) );
threadX.Name = "X";
threadY.Name = "Y";
threadX.Start ();
threadY.Start ();
threadX.Join ();
threadY.Join ();
// closing the log
LockManager.Log = null;
log.Close ();
System.Console.WriteLine ( "Press Enter..." );
System.Console.In.Read();
System.Environment.Exit ( 0 );
}
}
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